THE MIE CANAL PROJECT 【Project History】Main project history is the following. Aug.1951 The Mie Canal Project Request Union is established. Oct.1951 The Kiso River System Comprehensive Irrigation Office is opend. The Water Use Research is started. Apri.1964 The Design of the National Mie Canal General Execution is started. Dec.1965 The National Mie Canal Land Improvement Project Commencement is adopted. Aug.1966 The Mie Canal Land Improvement District is authorized. Oct.1966 MOAF(Ministry of Agriculture& Forestry) Irrigation Water Use Office is opened. Feb.1971 Directive of the Project Execution Principle is given. Mar.1971 Above plan is approved and succeeded by MOAF. The Mie Canal Project Office is started. Mar.1972 The Nakazato Dam construction is started. (completion is Mar.1977) Multipurpose Main Canal construction is started. Jan.1977 Directive of Project Execution Principle is given. (the first policy is changed) Jun.1977 The Miyakawa Dam construction is started. (completion is Mar.1980) Mar.1978 Directive of Project Execution Plan is authorized.(the first plan is changed) The Kasado Dam construction is started. (completion is Feb.1983) Jan.1983 The Inabe Multipurpose Main Canal construction is started. (whole completion is Mar.1986) Jun.1983 Multipurpose Main Canal from the Nakazato Dam to the Miyakawa Dam is complete. Apr.1984 Paddy field irrigation water supply is provisionally started. Mar.1986 The Uchiage Dam construction is started. (completion is Jul.1989) The Komono Dam construction is started. (completion is Oct.1989) Apr.1986 Tado industrial water supply is provisionally started. Mar.1987 The construction of Multipurpose Main Canal from the Miyakawa Dam to the Yuge Diversion Works is complete. Jul.1990 Directive of Project Execution Principle is given. (the second principle is changed) Aug.1990 Directive of Project Execution Plan is authorized. (the second plan is changed) Apr.1991 Domestic water supply is provisionally started. Mar.1993 Directive of Facilities Management Principle is given. Authorization of Facilities Management Regulation is approved. Apr.1993 The Mie Canal Office & Management is established. Oct.2003 Japan Water Agency is founded. 【Construction Period and Construction Cost】 Construction Period Apr1964 ~ Mar1992 Total Cost 10０bil. Yen The construction cost sharing is the following, pie graph fig.1 Industrial water 10% Beneficiary shares 1.6% Government Loan 5.6% subsidies 2.8% Domestic water Loan 12.9% Government 24% subsidies 37.4% Government subsidies 11.1% Irrigation water 66% Loan 27.5% Beneficiary shares 1.1% Fig.1 Construction cost sharing 【Overview of the Mie Canal Project】 Mie Prefecture is located in Japan and is adjacent to Aichi Prefecture. In Northwest Mie is a very large rice field that spreads from the foot of the Suzuka Mountains to the Ise-bay. Even though the farmers’ main sources of water were springs, small reservoirs, creeks and rivers, it was necessary for farmers to protect their sources so that they were guaranteed water in the future. In addition, in the fields at the foot of the mountains, farmers didn’t have any water source at all, and they strongly favored reclamation so that they didn’t have to continually depend on rainfall. Fig. 2 Location of Mie prefecture 50km Fig.3 Mie prefecture and location of the Mie Canal Project On the one hand, with industrial development and the increase in the population in this area, the demand for water had increased, and the lack of water had become an urgent problem. The Mie Canal Project was introduced in response to this problem. The project is as follows: Water is taken from the Makita River, which belongs to the Ibi River tributary of the Kiso River system in Gifu Prefecture, and diverted to the Nakazato Dam Reservoir. Also, the water from the Inabe River, the Kouchidani River, and the Hie River, all flowing into Mie Prefecture, is diverted. In addition, we built the multipurpose main canals to connect with the Miyakawa Dam, the Komono Dam, and the Kasado Dam. Water from the Tabika River, the Mitaki River, the Utsube River, and the Onnbe River is stored in the Komono and the Kasado Dams. Manbo(kind of qanāt) Digging Manbo by hand Spring Small reservoir Fig. 4 before the construction of the Mie Canal Fig.5 Schematic view of the Mie Canal Project General Plan By instituting the plan above, we supply a maximum of 5.99m3/s of irrigation water for 7300ha of farmland near four cities and two towns. In addition, we supply a maximum of 0.194 m3/s of industrial water and a maximum of 0.668m3/s of domestic water to a water purification plant. Industrial water 6.1million m3 (12.2%) TOTAL 50million m3 Supplementary irrigation water Domestic water 29.1million m3 3 14.8million m (58.2%) (29.6%) Fig.6 Annual Irrigation Water Source Plan Net deficit water volume 24.4million m3 (19.4%) TOTAL Existing water sources 125.7million m3 67.4million m3 (53.6%) Rainfall Natural fountains 33.9million m3 11.5% (27.0%) Ponds 5.0% Intake pipes 4.0% Sub-surface collecting conduits 1.1% Fig.7 Annual Irrigation Water Source Plan 【Dams and Reservoirs】 The purposes of the Uchiage Dam, the Nakazato Dam, the Miyakawa Dam, the Komono Dam, and the Kasado Dam are the following. Name of dam Purpose of dam The purposes of the Uchiage Dam are the following. This dam stores the water (5m3/s at the maximum) drawn from the Makita River and UCHIAGE supplies the coast of the Makita River. In addition, the water is conducted into the Nakazato Dam with 5m3/s at the maximum, 10 mil.m 3 per year. The purpose of this dam is to store the water of the self-basin and, in addition, water conducted from the Makita River, the Inabe River, and NAKAZATO the Kochidani River. Stored water is supplied to the user area. Furthermore, water from this dam supplies water to the Miyakawa Dam, the Komono Dam, and the Kasado Dam when necessary. The purpose of this dam is to store water, from a self-basin and conduct it from the Nakazato Dam; it also conducts paddy field irrigation water MIYAKAWA from the Miyakawa Regulating Reservoir through the Asake Irrigation Canal. This dam is located in the center of the Mie Canal Project. The purpose of this dam is to store and conduct the water from the Naakazato Dam, the Tabika River, the Mitaki River, the Utsube River, KOMONO and the Onnbe River. The water is supplied as irrigation water through the Taketani Irrigation Canal and is used as domestic water purifying it. This dam is located at the end of the project. The purpose of the dam is KASADO to store the water of the self-basin and conduct it into the Komono Dam. The stored water is used for irrigation and industry in Suzuka city. The specification of five dams and reservoirs are the following. Catchment area Nomal Effective Volume of Heigh of Lengh of Name of dam Direct Indirect water storage Type of dam dam body dam (m) crest (m) (km2) (km2) level (1,000m3) (1,000m3) UCHIAGE 1.4 EL.213.1m 2,200 Zoned earth 29.7 140.0 620 NAKAZATO 4.0 42.7 EL.192.0m 16,000 Zoned earth 46.0 985.0 2,970 MIYAKAWA 1.8 EL.125.2m 800 Zoned earth 27.0 350.0 390 KOMONO 0.8 34.3 EL.124.5m 1,600 Zoned earth 28.4 674.0 990 KASADO 6.9 EL 46.8m 3,000 Zoned earth 28.7 310.0 520 Fig8. Typical cross section of the Nakazato Dam 【Canals】 The canals in the Mie Canal Project are shown the following tables. ＜Multipurpose Main Canal＞ Design Kind of canal (m) Length Name of Canal canal (m) Inverted Closed Aqueduct Aqueduct Regulatin discharge Flume Tunnel Inlet (m3/s) siphon conduit (pipe) (flum) g weir Multipurpose Main Canal 7.3～2.5 41,920 1,830 13,630 24,400 1,330 200 110 330 90 Inabe Multipurpose Main Canal 1.7 17,410 0 1,330 16,08000000 Total 59,330 1,830 14,960 40,480 1,330 200 110 330 90 Ratio of kind of canal (%) 100 3.1 25.2 68.2 2.2 0.3 0.2 0.6 0.2 ＜Main Irrigation Canal＞ SIMO- Name of canal ASAKE TAKETANI OOKUBO SUZUKA Total Item /MARIGA Design canal 1.68 1.41 0.43 3.26 - discharge (m3/s) Diameter of pipe 1,000 900 600 1,650 - (mm) Length (m) 9,380 5,960 3,010 4,280 22,630 ＜Branch Irrigation Canal＞ Name of canal TAGUCH TAKETAN INABE ASAKE YAMADA FUKAMIZO Total Item I I Length (m) 9,450 1,460 6,970 7,760 11,310 6,590 43,540 ＜Diving Channel＞ Nortern Sourtern MITAKI Name TABIKA MAKITA Toreent Torrent River of h.r. River total River h.r. Intakes Intakes Intake Item Intake h.r. h.r. h.r. h.r. Design canal 5.0 4.3 3.2 1.4 2.7 - discharge (m3/s) Length (m) 4,581 4,791 8,033 44 1,804 19,253 【Intake Work on the Torrent Streams】 Water from eight small or medium-sized streams in the foothills of the Suzaka Mountains is carried to the Nakazato Dam, the Miyakawa Dam, and the Kasado Dam through both tunnels and a canal. When diverting water, it is important that we don’t infringe on vested water users downstream and that we set the limited intake flows at each of the eight rivers during irrigation or non-irrigation periods, and that we give priority to letting water run downstream, and that we not take over the limited intake flow amount for compulsory hydraulic facility systems.